# PRTG MBasize
#
# Simple PRTG Sensor to get mailbox statistics 
#
# Load last 5 Minutes from Messagestatistics and result as XML für PRTG 
# http://www.paessler.com/manuals/prtg/additional_sensor_types.htm
# http://www.paessler.com/manuals/prtg/exe_script_advanced_sensor.htm
#
# 32bit PowerShell !!!
#  Set-ExecutionPolicy -ExecutionPolicy remotesigned
#
#  Send mailbox names as arguments as delimited list
#
#
# 20121210 Ver1.0  Initial Version based on a exmetric
# 20121217 Ver1.1  Ersetze [int] durch [long]

write-host "Start PRTG Sensor" 
[string]$exchangeuri         = "http://nawex001.netatwork.de/PowerShell"
[string]$message ="Start:"
$error.clear()

if ($args.count -eq 0) {
	write-host "Parametercheck: no argument given Exit"
	[string]$message ="No mailbox in arguments"
}
else {
	write-host "Parametercheck: Total argument" + $args.count
	
	if (!(Get-Command "Get-OrganizationConfig" -errorAction SilentlyContinue)) {
		$error.removerange(0,1)  # remove last error
		write-host " Creating Exchange Remote Session"
		$session = new-pssession `
			-ConfigurationName "Microsoft.Exchange" `
			-ConnectionUri $exchangeuri `
			-Authentication Kerberos
		write-host " Import Exchange Remote Session Commandlets"
		import-pssession -Session $session -AllowClobber | out-null
	}
	Set-AdServerSettings -ViewEntireForest $true

	$result="<prtg>`r`n"

	foreach ($mailbox in $args){#
		write-host "Processing Mailbox:$mailbox"
		$mbstat =  get-mailboxstatistics -identity $mailbox
		if ($mbstat -eq $null) {
			write-host "  No statistic found für Mailbox:" + $mailbox
			$message+= $mailbox+":null:"
		}
		else {
			write-host "  Statistic found für Mailbox:" + $mailbox
			$size = ($mbstat).totalitemsize   # remote PowerShell delivers that a s a string 
			write-host "    TotalItemSize:" + $size
			if ($size -match "^.* \((.*) bytes\)$"){
				$sizeinMB = [math]::Truncate(([long]$Matches[1])/1MB)
				write-host "    TotalItemSizeMB:" + $sizeinMB
				$result+="  <result>`r`n"
				$result+="    <channel>"+$mailbox+"</channel>`r`n"
				# remote PowerShell sends a string instead of gb value so converting back
				$result+="    <value>"+([long](($size.split("(")[0]).replace(" ","")/1MB))+"</value>`r`n"
				$result+="    <customunit>MB</customunit>`r`n"
				$result+="    <mode>Absolute</mode>`r`n"
				$result+="  </result>`r`n"
			}
			else {
				write-host "    TotalItemSize: Not matching REGEX !"
				$message+= $mailbox+":"+$size+":nomatch:"
			}
		}
	}
	$result+="  <text>"+$message+"</text>`r`n"
	$result+="</prtg>"

	remove-pssession -session $session
}
write-host "End: ExitCode "$error.count

Write-host "Sending Result to output pipeline"
$result

if ($error) {
	#write-host "Found Errors"
	EXIT 1
}